I’ve tried doing the download on different machines and operating systems XP, Windows 7 and get the same result. I’ve also tried at different times of day but no change – is it me or you? Any advice?

It’s not the same for all files, others have downloaded and run ok, but I’ve found it on Historic county tops, Deweys, 490+, Humps, Marilyns, Myddryn Deweys, sub Deweys, Sub Donald Deweys, Sub 490’s & Sub-Humps.